Axial urging mechanism

ABSTRACT

An axial urging mechanism comprises a support device, a connecting seat, a pivotal shaft, and a pressing device. The support device provides two opposite lateral walls with a connecting end respectively. The connecting seat has two opposite wing ends corresponding to the connecting ends and is disposed between the connecting ends in a way of the connecting ends adjoining the wing ends respectively. The pivotal shaft passes through the connecting ends and the wing ends and provides a limit device at the inner wall surface of the respective wing end to press against the inner wall surface. The pivotal shaft has a thread screw section with a positive sense and a reversed sense at two end parts thereof respectively. The pressing device provides two follower levers and each follower lever has a lever base with a thread screw hole engaging with the respective thread screw section and the inner wall surface of the respective follower lever is attached to the respective connecting end of the support device. The lever part extending upward from the lever base connecting with an end of a connecting rod and another end of the connecting rod connects with a bearing bush, and the bearing bush being attached to the respective connecting end of the support device. Once the respective bearing bush is stirred, the respective connecting rod moves relative to the respective follower lever to actuate the respective lever base and the respective limit device such that the respective connecting end and the respective wing end can be urged in a state of being located tightly or become being released for making an adjustment.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an axial urging mechanism, andparticularly to an urging mechanism, which can be operated andcontrolled by way of a hand to actuate a pressing device disposed atboth ends of a pivotal shaft respectively so as to urge or release asupport device and a connecting seat between the two pressing devicessynchronously for locating or adjusting both of the support device andthe connecting seat.

[0003] 2. Description of Related Art

[0004] It has often been used in our daily life that a mechanicalstructure is formed by way of two articles with a respective connectingend being passed through with a pivotal shaft to generate a relativemovement between both of the articles. An arrangement with regard to twoarticles moving relative to each other generally can be classified intothree different types, that is, a fixed type, a moving type, and anadjustment type. The fixed type structure utilizes a conventional jointsuch as a welding joint to maintain both articles in a state of beingfixedly located after the connecting ends of the two articles beingpassed through with the pivot shaft. The moving type structure appliesanother conventional joint such as a rivet joint to allow both articlesin a state of moving relative to each other after the connecting ends ofthe two articles being passed through with the pivot shaft. Theadjustment type structure uses a further conventional way such as athread screw connection to fasten or loosen both of the articles so asto locate the articles or make an adjustment after the connecting endsof the two articles being passed through with the pivot shaft.Accordingly, a joint for two connecting articles can be presented withdifferent structures based on different applications.

[0005] Taking a keyboard stand as an example, the basis of design forthe keyboard stand has been directed to a concept of omni-bearing sincerecent years, that is, in addition to the most basic functions such aspushing forward and pulling backward, the keyboard stand can providefurther functions such as going up and down, displacing to the right andto the left, and adjusting the elevation angle. Indeed, The warm designhas brought a great convenience to the user. For instance, U.S. Pat.Nos. 5,839,373, 5,881,984, and 6,186,460B1 owned by the present inventorhave disclosed an axial urging device respectively and these urgingdevices basically provide a thread rod passing through and connectingwith two articles, a pressing lever fitting with a movable end of thethread rod, and an adjusting knob engaging with the thread rod. When theurging device is going to be adjusted, the user has to turn theadjusting knob with a hand to loosen the articles by means of thepressing lever and the other hand of the user holds the articles, whichintend to move, so that height thereof can be lifted or descended andthe elevation angle thereof can be adjusted. As soon as the articleshave been moved to a desired location, the adjusting knob is turned tobe in a state of tightening such that the articles can be urged to reacha state of being located firmly. This kind of urging device has beenutilized for years and even is applied in U.S. Pat. Nos. 5,257,767 and5,924,666. However, the prior art has involved in a common defect thatboth hands of the user have to be use at the same time during the urgingdevice being operated and this makes the user feel troublesome andinconvenient.

SUMMARY OF THE INVENTION

[0006] An object of the present invention is to provide an axial urgingmechanism, which has a support device, a connecting seat, a pivotalshaft, and a pressing device such that the connecting ends on thesupport device and the wing ends on the connecting seat can be urged ina state of being located tightly or become released for being adjustedby way of an operation with a single hand.

BRIEF DESCRIPTION OF THE DRAWINGS

[0007] The present invention can be more fully understood by referencingto the following detailed description and accompanying drawings, inwhich:

[0008]FIG. 1 is an exploded perspective view of an axial urgingmechanism according to the present invention with related componentparts;

[0009]FIGS. 2A, 2B and 2C are a top view, a front view and a partialsectional view respectively after the parts shown in FIG. 1 beingassembled;

[0010]FIGS. 3A, 3B and 3C are a top view, a front view and a partialsectional view similar to FIGS. 2A, 2B and 2C respectively to illustratethe axial urging mechanism being in a state of operation; and

[0011]FIG. 4 is a perspective view of an axial urging mechanismaccording to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Referring to FIGS. 1 to 4, an axial urging mechanism according tothe present invention basically comprises a support device 1, aconnecting seat 2, a pivotal shaft 3 and a pressing device 4.

[0013] Wherein, the support device 1 at both lateral sides thereofprovides a lateral wall 11 respectively corresponding to each other andeach lateral wall 11 at a connecting end 12 thereof has a slide groove13 for being passed over by the pivot 3. Another end opposite to theconnecting end 12 on the respective lateral wall 11 has a guide groove14 and an engaging hole 15 respectively so that the pressing device 4can displace along the guide groove 14 and a handle bar 16 at both endsthereof can join with the engaging hole 15 on the respective lateralwall 11 fixedly. Besides, an axial aperture 17 and a joining hole 18 areprovided at the upper portion of the respective lateral wall 11. Adetail with regard to the art of the axial aperture 17 and the joininghole 18 will be disclosed afterward with other related component parts.Furthermore, the respective lateral wall 11 at the top thereof extendsoutward a bearing plate 19 for connecting with an article such as akeyboard such that the support device can perform a function of support.

[0014] The connecting seat 2 is mounted next to the support device 1 andextends a wing end 21 from two lateral sides thereof respectively sothat the wing ends 21 can be disposed between the two connecting ends 12and provides an end groove 22 and an end hole 23 corresponding to theslide groove 13 and the axial aperture 17 respectively. Hence, thepivotal shaft 3 can be arranged to pass through the end grooves 22 andthe slide grooves 13 and a slender shaft 24 can pass through the endholes 23 and the axial apertures 17 such that the connecting seat 2 isable to movably join with the support device 1. Moreover, another end ofthe connecting seat 2 provides a liking device 25 to connect with arotary frame 6 via an engaging pin. Alternatively, the linking device 25is composed of two horizontal connecting shafts 251 opposite to eachother and two perpendicular arched plates 252 next to the connectingshafts 251. The rotary frame 6 at an end thereof provides a hook 61adjacent to both lateral sides thereof respectively to engage with thetwo connecting shafts 251 and the respective hook 61 at the bottom ofthe outer surface thereof can rotate along the arched plates 252 so thatthe rotary frame 6 is possible to keep upright in case of the connectingseat 2 being in motion.

[0015] The pivotal shaft 3 at both ends thereof passes over the endgroove 22 of the respective wing end 21 and the slide groove 13 of therespective connecting end 12 to provide a function of pivotalconnection. The difference of the pivotal shaft 3 from the conventionalart is that both ends of the pivotal shaft 3 provide a screw threadsection 32 respectively and the screw thread section 32 has two screwparts, wherein one is positive sense and the other one is reversedsense. In addition, the pivotal shaft 3 at the middle lever portion 31thereof between the screw thread sections 32 adjacent to an inner wallsurface of the respective wing end 21 provides a limit device 33 toprevent the wing ends 21 from shrinkage deformation caused by an axialurging force of the pressing device 4 such that the stability can besecured during urging. As shown in FIGS. 1 to 4, the limit device 33 isdisposed between the two wing ends 21 and provides a respective holdingplate 331 at both ends thereof to adjoin the respective wing end 21. Therespective holding plate 331 provides a pivot hole 332 and a shaft hole333 to align with the end groove 22 and the end hole 23 arranged on therespective wing end 21 so as to be passed over by the pivotal shaft 3and the slender shaft 24. The respective holding plate 331 at the lowerend thereof has an angle part being bent inward and an angle hole 334 isarranged to pierce the angle part corresponding to the respective pivothole 332 such that the middle lever portion 31 of the pivot 3 can passthrough the angle hole 334 of the respective holding plate 331 to movethe limit device 4. Further, a washer 7 can be added to the pivotalshaft 3 between the respective slide groove 13 and the respective endgroove 22 and can be added to the slender shaft 24 between therespective axial aperture 17 and the respective end hole 23 respectivelyto avoid a direct friction between the support device 1 and theconnecting seat 2.

[0016] The pressing device 4 is composed of two follower levers 41 andtwo connecting rods 42, and the respective follower lever 41 at thelower end thereof provides a lever base 411. The lever base has athreaded hole 412 with a positive sense and a reversed sense of internalscrews to engage with the respective screw thread section 32 such thatthe inner wall surface of the respective follower lever 41 can keep intouch with the wall surface surrounding the slide groove 13. Therespective follower lever 41 has an extending lever part 413 with aconnecting hole 414 at the upper end thereof to connect with a movableend of the respective connecting rod by means of a locating pin. Therespective connecting rod 42 at another end thereof has a fitting hole422 to be attached with a bearing bush 43 and the bearing bush 43 keepscontact with the respective guide groove 14 while the respectiveconnecting rod is in a state of moving.

[0017] Accordingly, the respective lower base 411 at the threaded hole412 thereof may displace outward along the respective threaded section32 at both ends of the pivotal shaft 3 to loosen the pressing forceagainst the respective connecting end 12 as soon as a user holds thehandle bar 16 with a hand by way of the thumb and the part between thethumb and the index finger thereof together with the rest four fingerspulling the bearing bush 43 forward along the guide groove 14 so as toresulting in the two connecting rods 42 moving forward with the twofollower levers 41 rotating synchronously. Hence, the connecting seat 2can move with respect to the axis of the connecting seat 2 and allow thetwo wing ends 21 to perform an angular movement due to the end groove 22keeping contact with the pivotal shaft 3 while the connecting seat 2 isin motion such that a function of adjusting the support device 1 movingupward or downward can be obtained. As soon as the adjustment has beenperformed, the bearing bush 43 is moved backward to result in theconnecting rods 42 moving relative to the follower levers 41. That is,the threaded holes 412 in the lower bases 411 engaging with therespective screw thread sections 32 such that the two connecting ends 12and the two wing ends 21 between the follower levers 41 and limit device33 are urged to perform the function of locating and fastening thesupport device 1.

[0018] Besides, in order to make it easier for the user during theoperation of adjustment, the bearing bush 43 is connected to a stirplate 44 and a second slender shaft 45 at both ends thereof passes overthe top of the stir plate 44 and fits with the two joining holes 18respectively such that two stages of actions with regard to moments offorce can be obtained from the second slender shaft 45 to the respectivebearing bush 43 and from the connecting rod 42 to the lower base 411 fora handiest operation with least effort as soon as the stir plate 44 isin operation.

[0019] Furthermore, the two follower levers 41 provide an automaticrestoring device 5 respectively to perform the automatic urging job. Therespective restoring device 5 has an end cap 51 to fit with a shaft endpart 34 next to the respective screw thread section 32 on the pivotalshaft 3 and has a spring 52 at an end thereof being fixedly attached tothe respective follower lever 41 and at the other end thereof beingfixedly attached to the end cap 51. Thus, the respective follower lever41 is able to move back to the original position thereof automaticallybecause of the restoring force of the spring 52 so as to be in a stateof locking automatically. Wherein, the respective shaft end part 34 atthe middle section thereof has a neck part 341 for the end cap 51 beingpossible to engage with the respective shaft end part 34, and a locatingpin 512 passes through a lock hole 511 in the end cap 51 and is receivedin the neck part 341 to prevent the end cap 51 from being apart from theaxial end part 34. A locating recess 513 is provided in front of the endcap 51 for fixing an end of the spring 52 and the other end of thespring 52 is inserted into a fitting hole 415 at the lower end of thefollower lever 41.

[0020] As it has been mentioned previously, the connecting seat 2 at anend thereof has a connecting device 25 to connect with a rotary frame 6in case of the present invention being applied to the keyboard stand.The rotary frame 6 at the top thereof has a central engaging hole 62 andat two lateral wings thereof provides a locating hole 64 respectively. Aconnecting lever 65 at an end thereof connects with the respectivelocating hole 64 and at the other end thereof is an eye end 651 to fitwith a projecting ring 418 at the inner side of the respective followerlever 41 to define the distance of movement between the rotary frame 6and the support device 1 while the support device 1 is adjusted to go upor down and provide an elevation angle. In addition, the rotary frame 6movably engages with the fixed plate A, which has been disclosed in U.S.Pat. No. 5,881,984, by way of the central engaging hole 62 being rivetedwith a spindle B such that the rotary frame 6 can be turned to the rightand to the left relative to the fixed plate A.

[0021] Hence, it is appreciated that the present invention can beoperated by a hand to control the pressing device so that two oppositelinking levers thereof can urge or loosen the support device and theconnecting seat disposed between the linking levers so as to adjust thesupport device going up or down and the angle of elevation thereofrelative to the connecting seat. By contrast with the known art, thepresent invention can be operated much easily and can be located morereliably as it is expected. Moreover, due to the automatic restoringdevice being designed appropriately, the present invention can keep in astate of being urged tightly. In addition, the present invention can bearranged to be associated with a rotary frame and a fixed plate so as toconstitute a keyboard stand with a function of being adjusted in a wayof omni-bearing.

[0022] While the invention has been described with reference to apreferred embodiment thereof, it is to be understood that modificationsor variations may be easily made without departing from the spirit ofthis invention, which is defined by the appended claims.

What is claimed is:
 1. An axial urging mechanism, comprising: a supportdevice, providing two opposite lateral walls and each of said twolateral walls having a connecting end being opposite to each other too;a connecting seat with two opposite wing ends, each of the two oppositewing ends corresponding to a respective connecting end and beingdisposed between said two connecting ends in a state of the connectingends adjoining the wing ends respectively; a pivotal shaft with two endparts, passing through the connecting ends and the wing ends, providinga limit device at an inner wall surface of the respective wing end in away of pressing against said inner side wall, having a thread screwsection with a positive sense and a reversed sense at the two end partsrespectively; and a pressing device, providing two follower levers andeach of the follower levers having a lever base with a thread screw holeprovided with a positive sense and a reversed sense for engaging withthe respective thread screw section of the two end parts, an inner wallsurface of the respective follower lever being attached to therespective connecting end of the support device, an lever part extendingupward from the lever base connecting with an end of a connecting rodand another end of the connecting rod connecting with a bearing bush,and the bearing bush being attached to the respective connecting end ofthe support device; whereby, once the respective bearing bush isstirred, the respective connecting rod moves relative to the respectivefollower lever to actuate the respective lever base and the respectivelimit device such that the respective connecting ends and the respectivewing end can be urged in a state of being located tightly or becomebeing released for making an adjustment.
 2. The axial urging mechanismaccording to claim 1, wherein the respective connecting end on thesupport device has an arched slide groove and an axial hole, and therespective wing end has an arched end groove and an end hole for beingpassed through by the pivotal shaft and a slender shaft respectivelysuch that the support device can be adjusted to go up or down and toconstitute a elevation angle with respective to the connecting seat. 3.The axial urging mechanism according to claim 2, a washer can added tothe pivotal shaft between the respective groove and the respective endgroove, and another washer can be added to the slender shaft between therespective axial hole and the respective end hole.
 4. The axial urgingmechanism according to claim 1, a guide groove is provided on therespective lateral wall of the support device at another end thereof tobe passed over by the bearing bush such that the bearing bush can keepin touch with the guide groove for a basis of displacement.
 5. The axialurging mechanism according to claim 1, wherein the bearing bush furtherconnects with a stir plate and the stir plat at a top thereof has asecond slender shaft to connect with the respective lateral wall of thesupport device such that the pressing device generates a relativemovement as soon as the stir plate is moved.
 6. The axial urgingmechanism according to claim 1, wherein a handle bar connects with therespective lateral wall on the support device and is disposed behind therespective bearing bush to be hold by and to support a hand.
 7. Theaxial urging mechanism according to claim 7, wherein the limit deviceprovides two holding plates to be disposed between the two wing ends andpressingly touch the two wing ends respectively with a pivot hole and ashaft hole on the respective holding plate for being passed through bythe pivotal shaft and the slender shaft.
 8. The axial urging mechanismaccording to claim 1, wherein the respective holding plate at the lowerend thereof has an angle part being bent inward and an angle hole isarranged to pierce the angle part corresponding to the respective pivothole such that the middle lever portion of the pivotal shaft can passthrough the angle hole of the respective holding plate 331 to form aarrangement of integral movement.
 9. The axial urging mechanismaccording to claim 1, further comprises two automatic restoring devicesand the respective restoring device has an end cap to fit with arespective shaft end part on the pivotal shaft neighboring therespective screw thread section and has a spring with an end thereofbeing fixedly attached to the respective follower lever and another endthereof being fixedly attached to the end cap so that the respectivefollower lever is able to move back to an original position thereofautomatically.
 10. The axial urging mechanism according to claim 9,wherein the respective shaft end part has a neck part and the respectiveend cap has a lock hole such that a locating pin passes through the lockhole to locate the end cap at the neck part, and a locating recess isprovided on the end cap for being inserted by an end of the spring andthe other end of the spring is inserted into a fitting hole at the lowerend of the follower lever.
 11. The axial urging mechanism according toclaim 1, wherein the respective lateral wall of the support device at atop thereof extends outward a bearing plate for connecting with anarticle.
 12. The axial urging mechanism according to claim 1, whereinthe connecting seat at another end thereof has a connecting device toconnect with a rotary frame to form a rotary state, and the rotary frameat a top thereof connects with a fixed plate such that the rotary framecan be turned to the right and to the left; and the rotary frame at twolateral wings thereof connects with an end of a connecting leverrespectively and another end of the connecting lever is an eye end tofit with a projecting ring at the inner side of the respective followerlever.
 13. The axial urging mechanism according to claim 12, wherein thelinking device at both lateral sides of the rotary frame provides a hookrespectively and both lateral sides of the connecting seat provides aconnecting shaft respectively so that the respective hook can engagewith the respective connecting shaft; and an arched plate is disposedunder the respective connecting shaft to support the respective hookwhile the respective hook is in a state of rotating.